1 files changed, 118 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/lib/vfs/UnixPathEqualityTest.java b/src/test/java/com/google/devtools/build/lib/vfs/UnixPathEqualityTest.java
new file mode 100644
index 0000000000..f5f58e2c7e
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/vfs/UnixPathEqualityTest.java
@@ -0,0 +1,118 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.lib.vfs;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/**
+ * This tests how canonical paths and non-canonical paths are equal with each
+ * other, and also how paths from different filesystems behave with each other.
+ */
+@RunWith(JUnit4.class)
+public class UnixPathEqualityTest {
+
+  private FileSystem otherUnixFs;
+  private FileSystem unixFs;
+
+  @Before
+  public void setUp() throws Exception {
+    unixFs = new UnixFileSystem();
+    otherUnixFs = new UnixFileSystem();
+    assertTrue(unixFs != otherUnixFs);
+  }
+
+  private void assertTwoWayEquals(Object obj1, Object obj2) {
+    assertTrue(obj1.equals(obj2));
+    assertTrue(obj2.equals(obj1));
+    assertEquals(obj1.hashCode(), obj2.hashCode());
+  }
+
+  private void assertTwoWayNotEquals(Object obj1, Object obj2) {
+    assertFalse(obj1.equals(obj2));
+    assertFalse(obj2.equals(obj1));
+  }
+
+  @Test
+  public void testPathsAreEqualEvenIfNotCanonical() {
+    // This path is already canonical, so there's no difference between
+    // the canonical / nonCanonical path, as far as equals is concerned
+    Path nonCanonical = unixFs.getPath("/a/canonical/unix/path");
+    Path canonical = unixFs.getPath("/a/canonical/unix/path");
+    assertTwoWayEquals(nonCanonical, canonical);
+  }
+
+  @Test
+  public void testPathsAreNeverEqualWithStrings() {
+    // Make sure that paths aren't equal to plain old strings
+    Path nonCanonical = unixFs.getPath("/a/non/../canonical/unix/path");
+    Path canonical = unixFs.getPath("/a/non/../canonical/unix/path");
+    assertTwoWayNotEquals(nonCanonical, "/a/non/../canonical/unix/path");
+    assertTwoWayNotEquals(canonical, "/a/non/../canonical/unix/path");
+  }
+
+  @Test
+  public void testCanonicalPathsFromDifferentFileSystemsAreNeverEqual() {
+    Path canonical = unixFs.getPath("/canonical/path");
+    Path otherCanonical = otherUnixFs.getPath("/canonical/path");
+    assertTwoWayNotEquals(canonical, otherCanonical);
+  }
+
+  @Test
+  public void testNonCanonicalPathsFromDifferentFileSystemsAreNeverEqual() {
+    Path nonCanonical = unixFs.getPath("/non/canonical/path");
+    Path otherNonCanonical = otherUnixFs.getPath("/non/canonical/path");
+    assertTwoWayNotEquals(nonCanonical, otherNonCanonical);
+  }
+
+  @Test
+  public void testCrossFilesystemStartsWithReturnsFalse() {
+    assertFalse(unixFs.getPath("/a").startsWith(otherUnixFs.getPath("/b")));
+  }
+
+  @Test
+  public void testCrossFilesystemOperationsForbidden() throws Exception {
+    Path a = unixFs.getPath("/a");
+    Path b = otherUnixFs.getPath("/b");
+
+    try {
+      a.renameTo(b);
+      fail();
+    } catch (IllegalArgumentException e) {
+      assertThat(e.getMessage()).contains("different filesystems");
+    }
+
+    try {
+      a.relativeTo(b);
+      fail();
+    } catch (IllegalArgumentException e) {
+      assertThat(e.getMessage()).contains("different filesystems");
+    }
+
+    try {
+      a.createSymbolicLink(b);
+      fail();
+    } catch (IllegalArgumentException e) {
+      assertThat(e.getMessage()).contains("different filesystems");
+    }
+  }
+}